CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2018		18,597
Balance at the beginning of the period at Dec. 31, 2018	$ 390.2	$ 0.2	$ (76.6)	$ 328.5	$ 243.2	$ (105.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11.8				11.8
Other comprehensive income, net of income taxes	(1.7)					(1.7)
Dividends declared	(7.6)				(7.6)
Shares purchased (Note 7)	(0.3)		(0.3)
Stock options exercised (in shares)		9
Stock options exercised	0.0
Restricted stock vesting (in shares)		3
Restricted stock vesting (Note 7)	(0.1)		(0.1)
Stock-based compensation	1.9			1.9
Ending balance (in shares) at Mar. 31, 2019		18,609
Balance at the end of the period at Mar. 31, 2019	394.2	$ 0.2	(77.0)	330.4	247.4	(106.8)
Beginning balance (in shares) at Dec. 31, 2019		18,678
Balance at the beginning of the period at Dec. 31, 2019	406.3	$ 0.2	(82.8)	334.1	268.1	(113.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	16.4				16.4
Other comprehensive income, net of income taxes	(2.6)					(2.6)
Dividends declared	(8.0)				(8.0)
Shares purchased (Note 7)	(3.6)		(3.6)
Stock options exercised (in shares)		3
Stock options exercised	0.0
Restricted stock vesting (in shares)		8
Restricted stock vesting (Note 7)	(0.2)		(0.2)
Stock-based compensation	1.5			1.5
Ending balance (in shares) at Mar. 31, 2020		18,689
Balance at the end of the period at Mar. 31, 2020	$ 409.8	$ 0.2	$ (86.6)	$ 335.6	$ 276.5	$ (115.9)